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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67d04ecec6790eba9b01d1f3e9587b830d1133615fe19dd0accc60387b1c3a4' 
  AND token = 'wBuaOHPjoQt0ppkaYMer0GqClnLgjXf879PAcZ1YyL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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