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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e1f53fd4ae18710b7fde58d570dac95e98f04cd4e2582ac2f140407618dcab1' 
  AND token = 'fwR+IVF42J9HdZ/sEQlQpHGiqKio/6+U12IdvTyp8VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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