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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8500e08709569988cfc72479d538434b405c3795622be9ea4a620f7499bbdb26' 
  AND token = 'beMGOH5AwBfrqcnOnfUqX/m3OBcEg9oZptT9eVL1RYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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