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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca4146895b5317f192b4b59553f8d0039b26ef7f15eec36356e98c5ecbe5e11e' 
  AND token = 'NANQ0AC1S5IbBgBmPJsaTf/qosqLxwEUALekc9T5eEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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