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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '306cdce3dddfaa7a7b3ba3d5449ee50a38bca7ea967b52d214c3cb3d31917fe6' 
  AND token = 'bDYOr1KhesBJo0nVh0zUzYaoA9IdfA5i4WwxKAccL2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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