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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c5c34348489bd5c890e7ece9c8960de8d4c7fad63c8a1bfb5efd1e67cc3ef0a' 
  AND token = 'lt7J2g61T4V6dT1+zmvMoxR4NY8Ttnqxo47sW089JZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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