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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dc301e249430504394e34fe3bc4bc48819de7b6b938b9c964fb8b352fa26e27' 
  AND token = 'NQyBSpRyhTkS2bJT+j2uvWtf2dVuET+TgUz7R2Lz8MA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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