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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '909f1f473204d9605b9080df2a6d1d7a58ad57da8377125d8b9510d00e66a2a1' 
  AND token = '1NTJNUp6uI2QugJH2ex5hUfQLzus/v3cUi2viT6zw4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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