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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abed69b2b36358ec5ddca755a1013a91897abe049f4a6fe7690b57f99f754451' 
  AND token = '9IOwEWT92Yv9pKd3BRqFbUip32pVRt8Idkz0AjDnqWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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