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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94c6edbe704781e3b8e30317b209b0ec1444a9cc156b128621f246e0587813a5' 
  AND token = 'n+gFHhrMlbh89I4Lc0M0b65Jh5vEoPQjA9EzA6HJB6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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