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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1be2e5315055e2e3629b1c543897b57287974199c0cf449625768d8c327d88d2' 
  AND token = 'Y2UuLZfFKqraSF2uUwotS4ti5SU9iapRAh2ygb8cgmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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