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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4a236eda892803dc27a7fd84850b0af33566f4da4306a45fe332fef62a3ef34' 
  AND token = 'i9Mo6JXiWS6XFLiDn02wXU+yk9jZYGueUpK45hyLaYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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