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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb8c401b2183babe981eed30e48a38f8c3ee0a049e8d5ae40f80d5454616127' 
  AND token = 'uA3J3ZijRKHluxzX39q5+k+m/ISDSnPMTcX7WZpUioI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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