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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e64fb8ce1b9c1dae59ad04977759475847d3e2dbe767495ad79353e6d561e38f' 
  AND token = '9KMO/tgbVks0xvNP9J5pzhOatjGMlWzyIDNGJRlfa10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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