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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25b7ad70c729b4abfac76f6a6b46d65abfd0096e6f70c5bdfd4d282400091d1b' 
  AND token = '032aKRzaw384xKem1u6Wt1VIwXH7eHb7kMzgQawhrBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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