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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b1a3de415dbd838f11ed28d09eae205f38f0ce7d6fd5ecddac17124edcc7c9a' 
  AND token = 'fuZnS1k+Y3uCB5Sa0Ti9PMhNBv6a91dh88GFtrFMkyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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