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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49764f203d0aab37b1b465bc018686d65e754704df9c2b315cbcc071264d5999' 
  AND token = 'xMgQpDSp1LV2pzc5cvrdAI4KKTTBWMLWZZDnpcZa8Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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