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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84218f8422b21632d5091e5a8f82660c468e223cc8be2effc4ac894c53f6e03' 
  AND token = 'crZPZiKIzYQA0oE8UbsgB8nR6aDL+spBdCmvaJL84uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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