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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7219553bd6d2a8a8d88a79faae114986ec350c1484f5de011c2ae882f9b0c38' 
  AND token = '/CWktYU6gqB3Nf3jiFJSgj3HaA6le07p8saAR3Qxjyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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