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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a3308211326dc1c82986f94d94ef8ea5237628770419866b1a3f2b6d0124b73' 
  AND token = '4pJiQ9QC4jPA4Q12aVPM1UzI1TjlPI7/GZ0T2dPHXLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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