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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0d4cb5c1b71e48e7b6a4a4a218364c217bbb0676c26cacf9c8f9fc582ecc888' 
  AND token = 'z4m/B5kEjgtDDsDVnQTc5sf0ecG8Tf6zS6j7UR+IHmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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