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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f7724a9bb94ff6e66c8fa80f6611fad786879b55318e142088cd72ada71005c' 
  AND token = 'fzSRZlLBnNbj65OKPWaQPHx3suOkcmdx6qBwMWYj0FY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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