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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df9a0ea9ee31af0d5b99c57df6e91d98d98c216d0489f63dabf0661d8b2ad17e' 
  AND token = '1m8cWxYxP5EXG0FQxGLWktbNZkYzU+kDasS61k06YUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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