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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '235a8c021e8a2c118d9169628409f722bdf03d853f54b8093d1b430cfce4019a' 
  AND token = 'RXvAi0IP2l65Q1170rcjUOxQoTJ9mia72t5vafpvTNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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