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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e113593aff4dfd5bb8793925f81b3fe22f634e92002a0d9e8d5d8356fcbe1bb9' 
  AND token = 'd0ePd1J8R7t+KrQN8Eyowle0a7weOU7BAV7wKd3NLNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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