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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ba0adcd6ade7878752bdb0bc5cf6d91820ff0ecaada7c4fe8d23aa356c9a02b' 
  AND token = 'gtWo3Li7CbmCMXE3ofO7BY6eW/Y+CzxGBmiwfL/WmG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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