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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb6102f00efe158a7f21860fdc6b5dd8b4a4d6f6e0f644274bd47f1134c010b4' 
  AND token = 'Xj2QcHfKjBkKTi07MwmNeYEsek804a4JLfMMxk+h5zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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