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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70e335b6b63b53a7200d0662a8e667254faf482592e56d26653e833c14766ae8' 
  AND token = '6cdQAynVMK3zi1UFxqu6FlDh0qq/Ol35GY4Lci4Dlzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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