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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb2a785b074ce6a95e356dba0b4f6ce1ab668e7c16df978a2cb6d2cab5d78401' 
  AND token = '92TcgjdLq6u3kATyJ97r3sDF5o0pE1nrhLoqCXXqoXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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