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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ecc2aaf1d7cad1e95700edd66912f756ee62b7e390cd9a1ef107b1a83746751' 
  AND token = '3js0YRCdQZ5jnJl/Mq3rTVbJkL8xj4lt2fg8W4IA4aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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