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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c9a62621c4a80bcbb0412164aa7b5b1114047e7ae26fc46aece0c12db57ede7' 
  AND token = 'FUA347QMt5SnF5+l+CV7y43LnQ4Be9vn/e1lyXSwhqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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