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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfb50fba57fee0ece505481d3ab766538ead6b12e67ce9397f5de980723e9fa9' 
  AND token = '1c8b+gsBnlgtZY/GvpQichGpzKyz2fCimxmbWNkz1zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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