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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74e19cf01be56798fdc4f01f5b93c85b294518aa6b6ea86c4ca2ae2a31567ded' 
  AND token = '9Q25Wudty0jeqVOQSDh9dIhFmjsi8ch7XTg5j9smOT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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