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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b04d018b9cc765253d845eacbf1269c9a5493deac9fd6cc45663f8256ff068e' 
  AND token = 'bO9mEqwMKCXRM9uoX5Ox8vpmVFe3JAkkGVaNGGv79hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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