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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ba2f7db9b1ee17d82413ad11ca0a1560b2fa535865b9ed32b43a9d752a1398c' 
  AND token = 'eWfJqQuro2J6x5bfLVYW3dPim8qRElMR1FM4C/kc9Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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