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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dade8a3d18b7e9583e91c41b2a8e016a4c048f77fed93bd06f62b8603b44e1f' 
  AND token = 'N//un2jsCPsk42OEf4BEgBepILldTDJlOlatDax0VM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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