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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d89aaded2d76f7387125266bf24705f89a3c88ac8dd288e6607101011fa253' 
  AND token = 'U48nkqhmve5/+ROkquCrkKvBUDeg+aDm/65y0lBIfuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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