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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b650d38f4d3d196eb0c04deb2726bbc476cf0e731c335da007c0cb58e77a2483' 
  AND token = '96e07Hi7aI007Th8u+0BT1qcvBsYkkvS0RlcziEFF14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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