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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b2d7ebc47bffaeb0da9eedb841a75f00536a35244cd501295efb45a3845ebf8' 
  AND token = 'aaJX5ABvXntotHobTGJM5qDNrjJWA8vCzJQEDoZimxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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