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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ec8d664cb1dc4708406f7d308e5096efabb2686a775e4fa5c9bb65a69e308d' 
  AND token = 'kplG7jcdy39xzWnfJwIdx3ex6dgVbzKI+Pc9ul1gxjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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