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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ebda07cf1f1e22bdc6a505c6dbc541129c7227550f64f087facb2d91aa32c27' 
  AND token = 'qFeIlhnV38J2bDIS0Popq0N1R2PtPH7cOt20v7chjJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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