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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25665924e519336feb10661f392c8985e1a8e0e93e1353331fedf373cb811ef7' 
  AND token = '6u1+DtdemNmg0RtbXpXpixBB8t+q+jbDWgwOdfw6/2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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