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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fad67d1424c8a7285ec94141d2b6b17a245c5ed768c2780fa6b59fadb860390' 
  AND token = '3XDbyF8HvFrp/qJr9LR83zD5YU8Jqkbm6TzDP4M/sac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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