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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd0bd76c94cc3af2cfe64d60006bb5ce213058de6f6d306dd9f22c739a355810' 
  AND token = 'swiJIfCRA2uFR059Ix/W8yw/NghMylMJ2YpBgWv6xt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}