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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b50e4cee492c76b8d7ec580e25f00083188c7804c92421b1360c6be5de6344a5' 
  AND token = '+m18F9uteiZY2eBgSrLBzyylWyojzopZ5Iyu1gkbB8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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