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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64cb3d84255ed45e876a496393a50666b7d929f0b1fdbceb20bf9c7aabf7c9e3' 
  AND token = 'EbThjn4MyJ/8wA3TWM+DZ5s0Caij7gAeOxN7q63Llyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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