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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be2e59ec755a71485a03adc1ed5e551d05ef828c9d2c76579d0ad734c2081c85' 
  AND token = '9jH6EhCu4WuYqlDgEh4PYWZSIpBDCtiGFVWdKWltjQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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