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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe3f0ee5fdb8a698e60fe3a54f27082ffc88b731c7325ad7d08133e2c67418a6' 
  AND token = 'Ny4y48B+f1JqijAi4s+0P37ah9nRCN/RccBQZJ12bgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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