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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a28d3f89e5257d7803e7847b090b8b4d36f4ebe9f5ab91af692d91fa05a7dfef' 
  AND token = 'Ig3t5Ug15LRSsPjronlVlP4S12neigSfCK0Ym5g9BGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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