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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af67d48c1e8bd1de5c1bc8ba49649bef403fa62bf8a055f3e2cbd8b0ae4b003e' 
  AND token = 'Vw9uWxHv5q6ROGdzjKRG9r3GTfDe3Fdm9CeOzCeP2/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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