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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a13479af0968938106769949e67d122344f4161b9fdc3738fbf3f64b9337ea8e' 
  AND token = '5ef3Y3vk75u88b8RbXCEA5Tf+YCUA+CEJYm5COUbbkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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