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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ea731cad648b242b767695f25eacbd5a3ce1509befd143320eee34fcf9d9f62' 
  AND token = 'Qy2RjmT64VgCN5EDtN7treny/O6lx5ZkK9/y412Jf6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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