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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a59f5a3e96c65467fb6026a250ef36708d8d79b34d19e0ea0178d4c7570e2661' 
  AND token = 'YVkEtBTL9TsSYh3vkqa6RRgdINmr/pYKDybuWtOYMmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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