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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f9b0d4480c0e2e9b02699bc4c2c30d847d13714851db67f734f700de7d7a1d4' 
  AND token = 'qhKwrPnRohRBz4YwzDZK6tuM9677mau9Wc9jC/T4J7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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