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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec1cd478e9f4a71c12f141c2d2338e6b62c53b88f7c5a53c3f0dea1c246b333' 
  AND token = 'K7fa7qsm+alzS7AghbZJ6ptkYYkaurJPCW1ABP9AbKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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